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Finding the Fourth Proportional to 86,813.62, 130,871.12 and 81,026.94

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Solution

The fourth proportional to 86,813.62, 130,871.12 and 81,026.94 is: 122,147.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,813.62 : 130,871.12 = 81,026.94 : x
  2. Step 2: Convert to fraction form
    86,813.62/130,871.12 = 81,026.94/x
  3. Step 3: Cross multiply
    86,813.62x = 130,871.12 × 81,026.94
  4. Step 4: Simplify right side
    86,813.62x = 10,604,085,328.48
  5. Step 5: Solve for x
    x = 10,604,085,328.48/86,813.62
  6. Step 6: Final answer
    x = 122,147.72

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.